Speed device and indicator.



M. R. HUTCHISON.

SPEED DEVICE AND INDGATOR.

APPLICATION FILED Nov.s,19o9. RBNEWBD MAR.1,1913.

MHA'S.

Patented July 22, 1913.

meter.

incense..

STATES PATENT OFFICE.

llvlILLEl. REESE HUTCHISONOF SUMMIT, NEJV JERSEY, ASSIGNOR TO THEINDUSTRIAL INSTRUMENT COMPANY, OF WATERBURY, CONNECTICUT, A CORPORATIONOF CON- NECTICTJT.

SPEED DEVICE AND INDICATOR.

Specification of Letters Patent.

i Original application led August 24, 1908, Serial No. 450,059. Dividedand this application filed November 8, 1909, Serial No. 526,852. RenewedMarch 1, 1913. Serial No. 751,649.

T o all whom t may concern.'

Be it known that l, MILLER Runen HU'roH- isoN, a citizen of the UnitedStates, and a resident of Summit, in the county of Union and .the Stateof New Jersey, have invented certain new and useful Improvements inSpeed Devices and Indicators, of which the following is a specification.

My present application is a division of my application No. 450,059,tiled August 24, 1908, wherein the various features of my invention areset forth at length.

My present invention relates to devices of the 'above type intended foruse on reversible shafts, especially Where the Work performed when theshaft is rotated in one direction is different in kind or degree fromthe work done when the shaft is reversed, or where the Work done byrotation in one direction tends to undo the Work done by rotation in theother direction. A propeller shaft which normally drives the vessel for-Ward but which tends to stop the vessel When reversed is a notableinstance ofsuch use.

It is characteristic of my speed indicator that the movement of theshaft is utilized to generate alternating pressures or currents whichare used to produce the indications. Such alternating pressures orcurrents ordinarily have no directional characteristic whereby currentsgenerated by rotation in one direction may be distinguished from thosegenerated by rotation' in the other direction, and equal speeds of the4reversible shaft in either direction would produce equal indicationsupon a voltmeter or volt age operating device. Suchbeing the case, anobserver looking at the indicator would he informed upon the absence ofany indication, or a Zero indication being given, that the operation ofthe shaft had ceased, but upon movement of the indicating meansresulting from'rotation of the shaft the observer would notbe informedof the direction of the rotation, Whereas by my invention an observer'will be informed of the di rection of rotation as Well as of the speedof the shaft. To accomplish this result I may use two generators mountedupon the same .shaft and connected respectively to the field coils andmovable coil of the volt- The angular relation of these generators issuchthat when the shaft moves in one direction the field coils andmovable coil are energized in the same phase, but when the propellershaft is reversed, oneof the generators is arranged to slipcircumferentially through an angle of 90 degrees, thereby changing itsphase 180 degrees from that of the other generator, thus reversing theeffect of the field coils on the movable coil. By" this arrangement theindicator is deflected in one direction for speeds of one direction, andin the reverse direction for opposite speeds.

The invention of my present application has for its object the provisionof certain improvements whereby in the `use of an electrical pressure orvoltage to produce an indication, I am enabled to have as manyindicating stations as desired. If desired, a* circuit may be extendedto fifteen or twenty stations and indicating" instruments for all thestations may be arranged in parallel circuits or branches. If, by reasonof the number or character of instruments the voltage of the generatoris modified at the instrument, each instrument of the equipment may becalibrated after installation in accordancefwith the observed rates ofspeed or Work.

The above described principles of my in-y vention ahd the manner inwhich they may be embodied in speed indicators YWill be more fullyunderstood from a detailed description thereof, in connection with theaccompanying drawing in which like characters of reference denoting likeparts are applied as inthe corresponding figures ofthe drawings of saidapplication No. 450,059.

Figure 1 is a vertical cross section through a pair of generators,together with a diagram of the circuit connections illustrating mypresent invention. Fig. 2 is a cross sec'- tion showing a modifiedarrangement for the plurality of armature windings.

In Fig. l l have shown a multiple circuit `arrangement operating toindicate speeds forward and speeds on the reverse by means ofindependently generated alternating cur- `rents operating in phase inone direction` and ship, it is desirable that open circuiting or shortcircuiting of one of the instruments should not seriously aect thereadings of the other. I have shown a frm of multiple station designedto minimize the effect of an open or short circuiting of. one oftheinstruments. In such case la separate circuit may be used for eachindicator, each circuit being independently connected with a separatewinding for the armatures. By. mal;- ing each armature winding of veryhigh internal resistance the effect of short circuiting or opencircuiting one of them will be decreased. In said Fig. 1, two magnetos140, 141 are employed to generate alternating volt-ages and currentsadapted to coperate to produce the requiredY in phase and out of phaserelations. The armatures of both magnets are provided withseparatewindings for each'indicating instrument. Thus, in the magneto 140, theseparate coil '150 generates alternating voltages which are appliedthrough the circuit of terminal 149., lead 143, terminal 47, field coilsQ6, 2T terminal 48, return 144, to coil 150. This magneto has its rotaryinductor 4 secured to shaft 152 in a fixed phase relation by key 152-3..The armature -of the other magneto 141 is supplied with acorresponding` independent winding 160, which supplies alternatingvoltages or currents through lead 146, terminal 43, indicator coil 28,terminal 44, and return 147, to the other terminal of said coil 160.This magneto 141 is rotated by shaft 152, through key 153, which has acircumferential play of 90 degrees in slot 154. The circumferentialextent of this slot is such that the currents generated in winding 160are in phase with currents generated in winding 150 of magneto 140 whenthe generator shaft 152 is rotated so as to maintain key 153 in theposition shown in Fig. 1, and out of phase when the ydirection ofrotation is reversed. Thus, when the currents .generated in windings150, 160 are in phase, and in the -same direction traverse the field andindicator coils a deflection of the index of indicator 10 will be causedin a direction indicated, as in Fig. 1, as toward the right. IV hen thegenerator shaft reverses and the currents become of opposite phase byslip of the indicator of magneto 141, .the current of magneto 140through the field coils 26, 27 is as before, but the currentv frommagneto 141 is reversed with respect thereto so that when thealternation causes ow of current from 140 out through=142, an equalcurrent from 141 instead of flowing out through 146, flows out through147 and back through 146, thus causing the index to move to the left.The second indicating instrument 10a is actuated by the alternatingvoltages or currents from windings 151, 161 of generators 140, 141respectively. These windings are insulated from coils 150, 160. Thecircuit of coil 151 is through lead 149, terminal 47a, field coils 26and 27, terminal 48a, and return 148 to the other terminal of coil 151.The circuit of coil 161 is through lead162, terminal 45a, indicatorIcoil QS, terminal 44a, and return 79 163, to the other terminal of coil161.

The operation of vthe currents generated in the windings 151, 161 in.phase and out of phase to actuate the indicating instrument 10a, is asdescribed above in connection 75 with the currents generated in windings150, 160. lVhere a considerable number of stations is desired, each ofthe wires of coils 150, 151 and .160, 1.61 may consist. of groups ofwires 164 (Fig. 2) which maybe symmet-rically arranged about the centralwire 165, and, if desired, provided with additional insulation, asindicated at 1603. The wire 165 may be -utilized as a core of soft iron,Aor as one of the inductor windings.

The' Alongitudinal arrangements of the wires'within the cable may beeither straight and i'parallel with the aXis, or preferably twistedspirally about the axis. This cable may be wound after the same manneras an ordinary single wire armature, and each wire thereof utilized as aseparate circuit, after the manner of 150, 160 and 151, 161respectively. By such an arrangement the iiuxes in each separate windingof the armature must be identical, and the short circuiting or opencircuiting of any one ofthe windings will have much less effect on anyone of the other windings, the error-.being divided among them. y

lVhile I have herein fully shown and described, and have pointed out inthe appended claims certain novel features of construction, arrangement,and operation which characterize my invention, it will be under- 105stood by those skilled in the art that various omissions, substitutionsand changes in the forms, proportions, sizes and details of the deviceand ofpits operation may be made without departing from the spirit of mv11n invention.

I claim- 1. In a multiple station speed indicating system, a pluralityof .alternating current generators, each comprising an armature 115 anda plurality of separate windings on the Y armature, a plurality ofindicating' instruments, circuit' connections between one instrument andone winding of each armature, and circuit connections between a second120 instrument and 'a second winding of each armature.

2. In a multiple station speed indicating system, a single mechanicaldriving means for derivingpower from the shaft whose 125 speed is to bemeasured, in combination with a plurality of alternating currentgenerators, all operated through said driving means, each comprising anarmature and a plurality of separate windings on the armature, 139

and a plurality of indicating instruments, circuit connections betweenone instrument and one wlnding of each armature, and circuit connectionsbetween a second instru-l nections between one instrument and onewinding of each armature, and circuit con nections between a secondinstrument and a second winding of each armature.

4. In a multiple station speed indicating system, a reversible shaftwhose speed is to be indicated, a plurality of alternating currentgenerators, each comprising an armature and a plurality of separatewindingson the armature, a plurality of indicating in-` struments,circuit connect-ions between one instrument and one winding of eacharmature, and circuit connections` between a second instrument and asecond winding of each armature, said generators being arranged to oerate in phase upon the rotation of the s aft in one direction toproduce equal indications of like direction of each of said indicatinginstruments.

5. In a multiple station speed indicating system, a reversible shaftwhose speed is to be indicated, a plurality of alternating currentgenerators, each comprising an arma'- ture and a plurality of separatewindings on the armature, a plurality of indicating instruments, circuitconnections between one instrument and one winding of each armature, andcircuit connections between a second instrument andk a second winding ofeach armature, said' generators being connected to operate in phase uponthe rotation of the shaft in one direction to produce equal indicationsof like direction of each of said indicating instruments, and to operateout of phase upon reversal of the shaft to produce equal indications oflike reverse d.

rection of each of said indicating instruments upon said reversal.

Signed at New York city, in the county of New York and State of NewYork, this 5th day of November, A. D. 1909.

MILLER REESE HUTCHI SON.

'Witnesses:

GEORGE C. DEAN, InvrNe M. OBRIEGHT.

